Isolation test for DROP INDEX CONCURRENTLY

for recent concurrent changes.

Abhijit Menon-Sen

src/test/isolation/expected/drop-index-concurrently-1.out

+Parsed test spec with 3 sessions
+
+starting permutation: noseq prepi preps begin explaini explains select2 drop insert2 end2 selecti selects end
+step noseq: SET enable_seqscan = false;
+step prepi: PREPARE getrow_idx AS SELECT * FROM test_dc WHERE data=34 ORDER BY id,data;
+step preps: PREPARE getrow_seq AS SELECT * FROM test_dc WHERE data::text=34::text ORDER BY id,data;
+step begin: BEGIN;
+step explaini: EXPLAIN (COSTS OFF) EXECUTE getrow_idx;
+QUERY PLAN     
+
+Sort           
+  Sort Key: id 
+  ->  Index Scan using test_dc_data on test_dc
+        Index Cond: (data = 34)
+step explains: EXPLAIN (COSTS OFF) EXECUTE getrow_seq;
+QUERY PLAN     
+
+Sort           
+  Sort Key: id, data
+  ->  Seq Scan on test_dc
+        Filter: ((data)::text = '34'::text)
+step select2: SELECT * FROM test_dc WHERE data=34 ORDER BY id,data;
+id             data           
+
+34             34             
+step drop: DROP INDEX CONCURRENTLY test_dc_data; <waiting ...>
+step insert2: INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100);
+step end2: COMMIT;
+step selecti: EXECUTE getrow_idx;
+id             data           
+
+34             34             
+134            34             
+step selects: EXECUTE getrow_seq;
+id             data           
+
+34             34             
+134            34             
+step end: COMMIT;
+step drop: <... completed>

src/test/isolation/isolation_schedule

@@ -14,3 +14,4 @@ test: fk-contention
 test: fk-deadlock
 test: fk-deadlock2
 test: eval-plan-qual
+test: drop-index-concurrently-1

src/test/isolation/specs/drop-index-concurrently-1.spec

+# DROP INDEX CONCURRENTLY
+#
+# This test shows that the concurrent write behaviour works correctly
+# with the expected output being 2 rows.
+#
+setup
+{
+	CREATE TABLE test_dc(id serial primary key, data int);
+	INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100);
+	CREATE INDEX test_dc_data ON test_dc(data);
+}
+
+teardown
+{
+	DROP TABLE test_dc;
+}
+
+session "s1"
+step "noseq" { SET enable_seqscan = false; }
+step "prepi" { PREPARE getrow_idx AS SELECT * FROM test_dc WHERE data=34 ORDER BY id,data; }
+step "preps" { PREPARE getrow_seq AS SELECT * FROM test_dc WHERE data::text=34::text ORDER BY id,data; }
+step "begin" { BEGIN; }
+step "explaini" { EXPLAIN (COSTS OFF) EXECUTE getrow_idx; }
+step "explains" { EXPLAIN (COSTS OFF) EXECUTE getrow_seq; }
+step "selecti" { EXECUTE getrow_idx; }
+step "selects" { EXECUTE getrow_seq; }
+step "end" { COMMIT; }
+
+session "s2"
+setup { BEGIN; }
+step "select2" { SELECT * FROM test_dc WHERE data=34 ORDER BY id,data; }
+step "insert2" { INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100); }
+step "end2" { COMMIT; }
+
+session "s3"
+step "drop" { DROP INDEX CONCURRENTLY test_dc_data; }
+
+permutation "noseq" "prepi" "preps" "begin" "explaini" "explains" "select2" "drop" "insert2" "end2" "selecti" "selects" "end"